| /* |
| * Copyright 2014 Google Inc. All rights reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #include <arpa/inet.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/socket.h> |
| #include <unistd.h> |
| |
| |
| static void usage(const char *progname) |
| { |
| fprintf(stderr, "\nUsage: %s 239.0.0.1 [224.0.0.2] [...]]\n", progname); |
| exit(1); |
| } |
| |
| |
| int main(int argc, char **argv) |
| { |
| int i, s; |
| struct in_addr sin; |
| |
| if (argc < 2) { |
| usage(argv[0]); |
| } |
| |
| if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { |
| perror("socket"); |
| exit(1); |
| } |
| |
| for (i = 1; i < argc; ++i) { |
| struct ip_mreq mreq; |
| char errbuf[256]; |
| |
| memset(&mreq, 0, sizeof(mreq)); |
| if (inet_pton(AF_INET, argv[i], &sin) != 1) { |
| snprintf(errbuf, sizeof(errbuf), "inet_pton(%s)", argv[i]); |
| perror(errbuf); |
| exit(1); |
| } |
| mreq.imr_multiaddr = sin; |
| mreq.imr_interface.s_addr = htonl(INADDR_ANY); |
| if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq))) { |
| snprintf(errbuf, sizeof(errbuf), "IP_ADD_MEMBERSHIP %s", argv[i]); |
| perror(errbuf); |
| exit(1); |
| } |
| } |
| |
| while (1) { |
| pause(); |
| } |
| // NOTREACHED |
| } |